This is all good advice. Also be sure that you are sitting on your "sit bones," tucking your pelvis, rather than arching your back and mashing your girly bits into the seat. This is where good core strength comes in! That, in addition to proper seat, proper seat position, good chamois and the help of some chamois butter/lanoline or some such, should do the trick. I know, a lot of variables to consider, but keep trying!